content: /* ===========================================================
   * JFreeChart : a free chart library for the Java(tm) platform
   * ===========================================================
   *
   * (C) Copyright 2000-2012, by Object Refinery Limited and Contributors.
   *
   * Project Info:  http://www.jfree.org/jfreechart/index.html
   *
   * This library is free software; you can redistribute it and/or modify it
   * under the terms of the GNU Lesser General Public License as published by
   * the Free Software Foundation; either version 2.1 of the License, or
   * (at your option) any later version.
   *
   * This library is distributed in the hope that it will be useful, but
   * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
   * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
   * License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with this library; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
   * USA.
   *
   * [Oracle and Java are registered trademarks of Oracle and/or its affiliates.
   * Other names may be trademarks of their respective owners.]
   *
   * --------------------------
   * HistogramDatasetTests.java
   * --------------------------
   * (C) Copyright 2004-2009, by Object Refinery Limited.
   *
   * Original Author:  David Gilbert (for Object Refinery Limited);
   * Contributor(s):   -;
   *
   * Changes
   * -------
   * 01-Mar-2004 : Version 1 (DG);
   * 08-Jun-2005 : Added test for getSeriesKey(int) bug (DG);
   * 03-Aug-2006 : Added testAddSeries() and testBinBoundaries() method (DG);
   * 22-May-2008 : Added testAddSeries2() and enhanced testCloning() (DG);
   * 08-Dec-2009 : Added test2902842() for patch at SourceForge (DG);
   *
   */
  
  package org.jfree.data.statistics;
  
  import org.jfree.data.general.DatasetChangeEvent;
  import org.jfree.data.general.DatasetChangeListener;
  import org.junit.Test;
  
  import java.io.ByteArrayInputStream;
  import java.io.ByteArrayOutputStream;
  import java.io.IOException;
  import java.io.ObjectInput;
  import java.io.ObjectInputStream;
  import java.io.ObjectOutput;
  import java.io.ObjectOutputStream;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertFalse;
  import static org.junit.Assert.assertNotNull;
  import static org.junit.Assert.assertNotSame;
  import static org.junit.Assert.assertSame;
  import static org.junit.Assert.assertTrue;
  
  /**
   * Tests for the {@link HistogramDataset} class.
   */
  public class HistogramDatasetTest
          implements DatasetChangeListener {
  
  
  
  
  
      private static final double EPSILON = 0.0000000001;
  
      /**
       * Some checks that the correct values are assigned to bins.
       */
      @Test
      public void testBins() {
          double[] values = {1.0, 2.0, 3.0, 4.0, 6.0, 12.0, 5.0, 6.3, 4.5};
          HistogramDataset hd = new HistogramDataset();
          hd.addSeries("Series 1", values, 5);
          assertEquals(hd.getYValue(0, 0), 3.0, EPSILON);
          assertEquals(hd.getYValue(0, 1), 3.0, EPSILON);
          assertEquals(hd.getYValue(0, 2), 2.0, EPSILON);
          assertEquals(hd.getYValue(0, 3), 0.0, EPSILON);
          assertEquals(hd.getYValue(0, 4), 1.0, EPSILON);
      }
  
      /**
       * Confirm that the equals method can distinguish all the required fields.
       */
      @Test
      public void testEquals() {
          double[] values = {1.0, 2.0, 3.0, 4.0, 6.0, 12.0, 5.0, 6.3, 4.5};
          HistogramDataset d1 = new HistogramDataset();
          d1.addSeries("Series 1", values, 5);
          HistogramDataset d2 = new HistogramDataset();
          d2.addSeries("Series 1", values, 5);
  
          assertEquals(d1, d2);
          assertEquals(d2, d1);
  
          d1.addSeries("Series 2", new double[] {1.0, 2.0, 3.0}, 2);
          assertFalse(d1.equals(d2));
          d2.addSeries("Series 2", new double[] {1.0, 2.0, 3.0}, 2);
          assertEquals(d1, d2);
      }
  
      /**
       * Confirm that cloning works.
       */
      @Test
      public void testCloning() throws CloneNotSupportedException {
          double[] values = {1.0, 2.0, 3.0, 4.0, 6.0, 12.0, 5.0, 6.3, 4.5};
          HistogramDataset d1 = new HistogramDataset();
          d1.addSeries("Series 1", values, 5);
          HistogramDataset d2 = (HistogramDataset) d1.clone();
          assertNotSame(d1, d2);
          assertSame(d1.getClass(), d2.getClass());
          assertEquals(d1, d2);
  
          // simple check for independence
          d1.addSeries("Series 2", new double[] {1.0, 2.0, 3.0}, 2);
          assertFalse(d1.equals(d2));
          d2.addSeries("Series 2", new double[] {1.0, 2.0, 3.0}, 2);
          assertEquals(d1, d2);
      }
  
      /**
       * Serialize an instance, restore it, and check for equality.
       */
      @Test
      public void testSerialization() throws IOException, ClassNotFoundException {
          double[] values = {1.0, 2.0, 3.0, 4.0, 6.0, 12.0, 5.0, 6.3, 4.5};
          HistogramDataset d1 = new HistogramDataset();
          d1.addSeries("Series 1", values, 5);
  
              ByteArrayOutputStream buffer = new ByteArrayOutputStream();
              ObjectOutput out = new ObjectOutputStream(buffer);
              out.writeObject(d1);
              out.close();
  
              ObjectInput in = new ObjectInputStream(
                      new ByteArrayInputStream(buffer.toByteArray()));
          HistogramDataset d2 = (HistogramDataset) in.readObject();
              in.close();
  
          assertEquals(d1, d2);
  
          // simple check for independence
          d1.addSeries("Series 2", new double[] {1.0, 2.0, 3.0}, 2);
          assertFalse(d1.equals(d2));
          d2.addSeries("Series 2", new double[] {1.0, 2.0, 3.0}, 2);
          assertEquals(d1, d2);
      }
  
      /**
       * A test for a bug reported in the forum where the series name isn't being
       * returned correctly.
       */
      @Test
      public void testGetSeriesKey() {
          double[] values = {1.0, 2.0, 3.0, 4.0, 6.0, 12.0, 5.0, 6.3, 4.5};
          HistogramDataset d1 = new HistogramDataset();
          d1.addSeries("Series 1", values, 5);
          assertEquals("Series 1", d1.getSeriesKey(0));
      }
  
      /**
       * Some checks for the addSeries() method.
       */
      @Test
      public void testAddSeries() {
          double[] values = {-1.0, 0.0, 0.1, 0.9, 1.0, 1.1, 1.9, 2.0, 3.0};
          HistogramDataset d = new HistogramDataset();
          d.addSeries("S1", values, 2, 0.0, 2.0);
          assertEquals(0.0, d.getStartXValue(0, 0), EPSILON);
          assertEquals(1.0, d.getEndXValue(0, 0), EPSILON);
          assertEquals(4.0, d.getYValue(0, 0), EPSILON);
  
          assertEquals(1.0, d.getStartXValue(0, 1), EPSILON);
          assertEquals(2.0, d.getEndXValue(0, 1), EPSILON);
          assertEquals(5.0, d.getYValue(0, 1), EPSILON);
      }
  
      /**
       * Another check for the addSeries() method.
       */
      @Test
      public void testAddSeries2() {
          double[] values = {0.0, 1.0, 2.0, 3.0, 4.0, 5.0};
          HistogramDataset hd = new HistogramDataset();
          hd.addSeries("S1", values, 5);
          assertEquals(0.0, hd.getStartXValue(0, 0), EPSILON);
          assertEquals(1.0, hd.getEndXValue(0, 0), EPSILON);
          assertEquals(1.0, hd.getYValue(0, 0), EPSILON);
          assertEquals(1.0, hd.getStartXValue(0, 1), EPSILON);
          assertEquals(2.0, hd.getEndXValue(0, 1), EPSILON);
          assertEquals(1.0, hd.getYValue(0, 1), EPSILON);
          assertEquals(2.0, hd.getStartXValue(0, 2), EPSILON);
          assertEquals(3.0, hd.getEndXValue(0, 2), EPSILON);
          assertEquals(1.0, hd.getYValue(0, 2), EPSILON);
          assertEquals(3.0, hd.getStartXValue(0, 3), EPSILON);
          assertEquals(4.0, hd.getEndXValue(0, 3), EPSILON);
          assertEquals(1.0, hd.getYValue(0, 3), EPSILON);
          assertEquals(4.0, hd.getStartXValue(0, 4), EPSILON);
          assertEquals(5.0, hd.getEndXValue(0, 4), EPSILON);
          assertEquals(2.0, hd.getYValue(0, 4), EPSILON);
      }
  
      /**
       * This test is derived from a reported bug.
       */
      @Test
      public void testBinBoundaries() {
          double[] values = {-5.000000000000286E-5};
          int bins = 1260;
          double minimum = -0.06307522528160199;
          double maximum = 0.06297522528160199;
          HistogramDataset d = new HistogramDataset();
          d.addSeries("S1", values, bins, minimum, maximum);
          assertEquals(0.0, d.getYValue(0, 629), EPSILON);
          assertEquals(1.0, d.getYValue(0, 630), EPSILON);
          assertEquals(0.0, d.getYValue(0, 631), EPSILON);
          assertTrue(values[0] > d.getStartXValue(0, 630));
          assertTrue(values[0] < d.getEndXValue(0, 630));
      }
  
      /**
       * Some checks for bug 1553088.  An IndexOutOfBoundsException is thrown
       * when a data value is *very* close to the upper limit of the last bin.
       */
      @Test
      public void test1553088() {
          double[] values = {-1.0, 0.0, -Double.MIN_VALUE, 3.0};
          HistogramDataset d = new HistogramDataset();
          d.addSeries("S1", values, 2, -1.0, 0.0);
          assertEquals(-1.0, d.getStartXValue(0, 0), EPSILON);
          assertEquals(-0.5, d.getEndXValue(0, 0), EPSILON);
          assertEquals(1.0, d.getYValue(0, 0), EPSILON);
  
          assertEquals(-0.5, d.getStartXValue(0, 1), EPSILON);
          assertEquals(0.0, d.getEndXValue(0, 1), EPSILON);
          assertEquals(3.0, d.getYValue(0, 1), EPSILON);
      }
  
      /**
       * A test to show the limitation addressed by patch 2902842.
       */
      @Test
      public void test2902842() {
          this.lastEvent = null;
          double[] values = {0.0, 1.0, 2.0, 3.0, 4.0, 5.0};
          HistogramDataset hd = new HistogramDataset();
          hd.addChangeListener(this);
          hd.addSeries("S1", values, 5);
          assertNotNull(this.lastEvent);
      }
  
      /**
       * A reference to the last event received by the datasetChanged() method.
       */
      private DatasetChangeEvent lastEvent;
  
      /**
       * Receives event notification.
       *
       * @param event  the event.
       */
      @Override
      public void datasetChanged(DatasetChangeEvent event) {
          this.lastEvent = event;
      }
  
  }
  